SELECT * FROM question_mgmt as q WHERE id=6118 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=11 AND subId=16 AND chapterId=475 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 7th science Light david is observing his image in a plane mirror th

Question:

David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be

(i) 3 m        (ii) 5 m
(iii) 6 m      (iv) 8 m

Answer:

(iii) 6 m

mirror
Initially David is standing in front of the mirror.
The distance between him and his image = 4 m
David moves 1 m towards the mirror
The distance of David from the mirror will be 3 m
Distance of the image from the mirror = 3 m

Therefore, the distance between David and his image = 3 m + 3 m
                                                                                      = 6 m.


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